Reinforced bar for concrete.



PATENTED MAR. 10, 1908.

N c. F. VARNBY. REINFORCED BAR FOR CONCRETE.

APPLICATION FILED JULY 26.1907.

lNVEN TOR (ZqrZesZ'? A TTORNE YS' UNITED STATES PATENT OFFICE.

CHARLES F. VARNEY, or NEW roan N. Y.

To all whom itmqy concern: Be it known that I, CHARLES F. VARNEY, a citizen'of-the United States, and a resident 'of the city of New York, borough of Manhat-- tan, in the county and State of New'York, have invented a new and Improved. Reinforced Bar for Concrete, ofwhich the following is a full, clear, and exact description.

This invention'relates to certain improvements in bars, rods, or trusses designed for use in the construction of concrete beams, girders, Walls, floors, columns, and the like, and the object of the a construction in more tension members arranged parallel or at any desired angle to each other and connected by shear members, adjacent ends of a plurality. of the latter being intertwined to old them together and form the first-mentioned tension members. The intertwining may be securedby twistin braiding, or in any othersuitable manner to insure the retention of the strands in enga ement with each other, and without the 'ai of separate tie pieces. In the preferred construction, the main tension bar, which extends along a concrete beam or girder adjacent the lower surface thereof, is madeup of a plurality of strands of any desired form in cross section.

80 As the main tension bar ap roaches the end of the girder or a support tli strands or groups of strands leave the tension member at intervals along the length and extend at an angle thereto torform shear 85 members. .The strands forming the separate shear members are then brought together and intertwined to form a. second tension member extending parallel to the main tension member, or at any. desired angle thereto. By

40 means of this construction, the separate teni'sion members are securely and firml an-f chored in the concrete by the irregularity in contour formed by the intertwining, and the ends of the shear bars are firmly held in place, inasmuch as they are integral with the strands forming the tension members. minimum amount ofmetal is employed-and this metal is distributed at the points where needed and in proportion to the need. The

area at its center and decreases toward the ends, while the second and small tension" members are of greatest cross sectional area at A Specification of Letters Patent. Application filed July 26, 1907. Serial). 886,600.

the reinforcement invention is to provide which there are two' or.

er'efor, separate .at whic main tension bar is of greatest cross sectional Patented starch 10, 1908.

p is uniform throughbar, as the same number out the length of the present throughout the entire of strands are length. The invention consists in certain features of construction and combinations of parts, all of which will be fully set forth hereinafter and particularly pointed out inthe claims. Reference-is to be had to the accompanyirig drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the j figures, and in which I Figure 1 is aside elevation of one form of reinforcing bar involving my invention; Fig. 2 is a' side elevation of a slightly modified form, showing the distribution of the "arts within a concrete beam or girder; and 3 isa side a further modification. j

y In the specific form illustrated in Fig, 1, I' providea main lower tension bar 10 made up of a plurality of strands intertwinedto retain them in engagement witheach other. vTh'e specific form of intertwining illustrated involves the simple twisting of the strands about each other. At ploints upon opposite sides of the center of t e bar and at equal distances therefrom, one of the strands 11 is separated from the main body of the bar and extends at an angle 'theretoto form a shear bar. At ajshort distance from the bed of the bar 10 depending upon the height 0 the der, floor, or other structure in connection with which the bar is being employed,

this strand is again bent to form a second tension bar 12, substantially arallelto the elevation of one end of a bar showing main tension bar, or if desire at any suitable an 'le thereto. 7

the strand-ll leaves the main bar and the end of the bar bent to form a secon shear bar extending toward the tension bar and parallel with thef first-mentioned shear bar, or at anyldesired angle thereto. At the pointat w "chthi's shear bar. intersects the single stranded portion of thetension member 12, it is bent-to lie parallel to said single strand, and the two are mterwine'd to form a second sectionof the upper or auxiliary tension bar. Any number or all of the strands of the tension barl0 may beseparated off at intervals, and bent -up-;

to the upper strand and there intertwined with the others to. increase the size of said upper tension bar;

Intermediate the point In the specific form illustrated in Fig. 1, the main tension bar at its center is made up of four strands, and three of these branch off to form the shear bars 11, 13 and 14, the fourth strand 15 remainin to form the terminal portion of the mam tension bar. The intertwined ends 16 of the strands at the terminal of the upper tension bar" may be bent form an anchorage, or may be secured to the adjacent end of a second reinforcing bar, or may be employed for securing the end of the reinforcing bar in place in any suitable manner. i

If it is desired to make a continuous beam or girder having a support intermediate its ends, the upper tension bar 12*, at one side of a support, partition, or wall 18, may be formed integral with the adjacent u per tension-bar 12 upon the o posite sidbof the support, partition, or wa as illustrated in Fig. 2. In this construction, it will be noted that the formation is the same save that the strands of one upper tension bar instead of i being bent at an angle to form an anchorage,

as shown in Fig. 1, are extended across and constitute the strands of the other upper tension bar. The distribution ofv the concrete 19 inFig. .2, is substantially the same as would be employed in connection with the bars shown in Fig. 1, namel the lower or: main tension bar is locate adjacent the lower surface of'the concrete and the upper or auxiliary tension bar is located adjacent the upper surface of the concrete.

It 1s evidentthat neither the upper and lower tension bars, nor the se arate shear- 'bars, need necessarily lie paralle In Fig. 3

I have-illustrated one end of a bar similar to that illustrated in Fig. 1, but in which there I is an extra shear bar 26) leaving the lower tension bar at the same point as the shear bar 14,- but lnstead of extending parallel to this shear bar, it extends at a more. acute angle and unites with the upper tension bar at a point closely adjacent the upper end of the shear bar 14.

l laving thus described my invention, 1, 1 claim 'as new and desire to secure by Letters Patent:

1.- A .metallic reinforcement for concrete structures, composed solely of a plurality of strands twisted together for a distance intermediate their ends to. form a main lower tension bar, said strands having portions bent laterally to form a lurality of substantially parallel incline shear members spaced apart adjacent each end of said main tension bar, and the terminal portions of said strands being reunited and twisted together to form two upper tension bars substantially parallel to said lower tension bar adjacent each end thereof, and integral with and in the same vertical plane as said shear members and said lower tension bar.

2. A metallic reinforcement for concrete structures, including two substantially parallel tension bars lying in the same vertical plane and each formed 'of a plurality of strands twisted together,'the strands of each barincreasing in number along the length thereof in opposite directions, and the strands of one bar being integral with the strands of the other bar and connecting the two together at a plurality of oints to form di agonal shear members, a lying in the vertical plane of said bars.

3. A metallic reinforcement for concrete. beams, girders and the like, comprising a tension bar formed of a plurality of strands twisted together and of decreasing number from the central portion thereof toward the ends, said bar adapted to extend over a supporting point, adjacent the u iper surface of the concrete, and two tension ars'below the ends of the said first-mentioned bar and in the same vertical lane therewith, each of said last-mentioned bars being formed of a plurality of strands twisted together, the strands of the first-mentioned bar being integral with the strands of each of the other bars and having diagonally-disposed connecting portions spaced apart to-form shear members "in said vertical plane and at opposite sides of said su porting point.

"4. A metallic'rei orcement for concrete structures, comprising two substantially parallel tension bars lying in the same vertical plane, each bar being formed of a plurality of strands twisted together and the number of strands of each bar varying along the length thereof, the strands of one bar beingintegral with the strands of the other bar and constituting the sole connecting means between the two and forming a plurality of inclined shear members in the same vertical pane with said bars, the number of strands cut by a vertical plane through said metallic reinforcement being uniform throughout the length thereof.

5. A metallic reinforcement for concrete beams, girders and the like, comprising two substantially parallel tension bars lying in the same vertical plane, each bar being formed of a plurality of strands twisted together and the number of strands of each bar varying along the length thereof, the strands of each bar eing integral with the strandsv of the other bar and constituting the sole connecting means between the two and forming a plurality of inclined shear members in the same vertical plane with said bars, car-- with eac of said shear members, the upper ends. of each of said shear members being twisted together to anchor the same and to form a second tension bar also anchored against longitudinal moyemen 7 A reinforcingmeans for ce'mentitious' bodies, composed of a lower tension bar formed of a plurality of strands twisted to? gether, the ends of said strands being extended to form shear members,;all lying in substantially the same vertical plane, and an upper tension bar composed of the upper ends of each of said shear members secured together by twisting.

8. A reinforcing structure for concrete, comprising a bar formed of a plurality of rods at diverwith the.

or strands twisted together, certain of said rods or strands having portions extending laterally at one side ofithe bar to form a series of spaced shear members, and the terminal portions of said rods or strands being reunited and twisted together to form a second bar substantiallyparallel to the firstmentioned bar.

9. A reinforclng structure for concrete,

comprising two substantially parallel bars, each formed of aplurality of rods or strands twisted together, certain of the strands of one bar being integral with the strands of the other bar and connecting the two bars to form a plurality of spaced-shear members.

In testimony whereof I'have signed myname to this specification in the two subscribing witnesses.

CHARLES F. VARNEY.

Witnesses:

CLAIR W. FAIRBANK, JoHN P. DAVIS.

presence of 40 v 

